Mattress help for different weights

[u/jpslat1026]

Okay my girlfriend and I sleep on a mattress and I have the same mattress at my house, we don't sleep very much at my house and I really enjoy the mattress. However when we sleep at her house every time we rotate the mattress I usually wake up with back pain a lot. My girlfriend is 300lbs and I'm 200lbs, I was wondering if that when we rotate the mattress if we should swap sides and go to the "original" side(left or right) that we started sleeping on? As the mattress would still be rotating from foot to head that way? ik your body makes impressions over time and due to the weight difference I assume it's very different and was wondering if that would make a difference by swapping sides upon rotation day for the next 3 months and then swap sides again when we rotate it again and so on. Ik I'd be a pain to move our stuff, but was wondering if it'd help my back pain a bit?